* rst double colons for example code

* add nx. prefix to doctest function calls

* Remove one line from 1->2 migration rst file

the line shows code that works for 1.x *and* 2.x.
But it no longer works for all v2.x code.  Readers should just use the
next line of code, so no reason to keep this in the file.

* capture output from subplot and rename DiGraph as DG in introduction.rst

* skip running the entire test suite as an example in old_release_log.rst

* doctest of examples

* remove changes to nexp files

* Raise ValueError if None is added as a node.

Removed some tests that checked that errors raised when None was a node.

* update tutorial to make a stronger statement about None

* Fix links, use DOI links, wayback machine where required

* Add nx-guides to intersphinx mapping.

* Replace external mpl link w/ intersphinx.

* Update mpl intersphinx mapping.

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

* Update tutorial.rst - Fixes #4249

* STY: 80ish char line limit for source file.

* Wrap example in nbplot, for consistency.

* Update tutorial.rst

Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>

* DOC: rm windows-specific note/instructions.

Assume user knows how to install scientific Python software on their
chosen platform.

* DOC: rely on intersphinx for hashable def

 * Removes the hashable term from the nx glossary and instead refer to the
   Python glossary via intersphinx.
 * Wording was from the Python2 docs and had become out-of-sync with the
   Python glossary entry

* DOC: minor fixup to glossary

* DOC: Add node attr example and links.

 * Add a few links to glossary terms and forward-refs to the tutorial
   section on attributes.
 * Add an example of add_nodes_from with attribute dicts.
 * Minor rewordings.

* DOC: Add a few more section headings.

 * Adds three new section headings to the tutorial to better match
   the natural organization of the material.
 * Adds additional sentence contextualizing constructors.

* DOC: add link to nbunch glossary entry

* DOC: Wording change.

* DOC: change property links from meth to attr roles.

Prevents the () from being added to properties in the
rendered docs

* DOC: beef up indexing example.

Add edge attribute so that the result is clearer than returning an
empty dictionary

* STY: code style fixup in nbplot

* DOC: More precise wording in comment

* DOC: switch to autosummary for graph creation.

Adds autosummary-generated table for graph creation methods to
tutorial. Nice because the methods are linkable, but may be overkill

* DOC: Remove pylab suggestion.

Use of --pylab is discouraged, so remove the suggestion from tutorial

rST formatting: None as inline literal

find -name "*py" | xargs grep -n '" % '
find -name "*py" | xargs grep -n '"\.format('
find -name "*py" | xargs grep -n "' %"
find -name "*py" | xargs grep -n 'msg % '
find -name "*py" | xargs grep -n ' %d '
find -name "*py" | xargs grep -n '\.format('

* Update docs for G.copy and set_*_attributes.

Fixes #2899 and #2859

* fix tutorial and docs of to_*directed

Fixes #2849

* fix docs for asyn_fluidc

Fixes #2845

* Allow seed to change in connected_watts_strogatz_graph

Also update docs.  Fixes #2809

* Add tests for exceptions to asyn_fluidc

* Add tests for random graphs